Adds solutions to promise exercises

promises/exercise-1.js

@@ -4,13 +4,14 @@ require('es6-promise');
 // Then, print the contents of the promise after it has been fulfilled by passing console.log to then.
 
 const promise = new Promise(function(resolve, reject) {
-  setTimeout(() => {
-    resolve('FULFILLED!');
-  }, 300);
+  setTimeout(() => resolve('FULFILLED'), 300);
 });
 
-const onResolve = data => {
-  console.log(data);
+const printWhenSuccessful = data => {
+  console.log('SUCCESS:', data);
 };
 
-promise.then(onResolve);
+promise.then(printWhenSuccessful);
+
+// promise.then((value) => printWhenSuccessful(value));
+

promises/exercise-2.js

@@ -4,9 +4,21 @@ require("es6-promise");
 // Create a function onReject to print error.message using console.log. Pass this function as a rejection handler to the then method of your promise.
 
 const promise = new Promise(function(resolve, reject) {
-  // Your solution here
+  const error = new Error('REJECTED!');
+  setTimeout(() => reject(error), 300);
 });
 
-const onReject = value => {
-  // Your solution here
+const printOnSuccess = value => {
+  console.log('SUCCESS:', value)
 };
+
+const printOnFail = error => {
+  console.log('FAIL:', error.message);
+};
+
+
+// promise.then(printOnSuccess, printOnFail);
+
+promise
+  .then(printOnSuccess) // printOnSuccess won't be called since our promise rejects 
+  .catch(printOnFail);

promises/exercise-3.js

@@ -1,3 +1,7 @@
 const fetch = require('node-fetch');
 
 // Make a fetch request to https://next.json-generator.com/api/json/get/EJPkuFBIV
+
+fetch('https://next.json-generator.com/api/json/get/EJPkuFBIV')
+  .then(response => response.json())
+  .then(data => console.log('data is', data));

promises/exercise-4.js

@@ -18,22 +18,41 @@ const listOfWines = [
 
   const myPromise = new Promise((resolve, reject) => {
     // Your solution for #1 here
+    setTimeout(() => resolve(listOfWines), 3000);
   });
 
   const onSuccess = value => {
-    // Your solution here
+    console.log(value); 
+
+
+    // extra challenge A solution:
+      // value
+      //   .filter(wine => wine.type === 'Red')
+      //   .forEach(wine => console.log(wine)); 
   };
 
   // Use myPromise here with onSuccess
-
+  myPromise.then(onSuccess);
 
 
   const myFailedPromise = new Promise((resolve, reject) => {
     // Your solution for #3 here
+    setTimeout(() => reject('something is broken'), 3000);
   });
 
-  const onReject = value => {
-    // Your solution here
+  const onReject = error => {
+    console.log(`Oh no, the request failed because ${error}`);
   };
 
-  // use myFailedPromise here with onReject
+  myFailedPromise.catch(onReject);
+
+
+  // Extra challenge A & B combined together:
+
+  myPromise.then(
+    wines => {
+      console.log('my filtered wines: ');
+      wines
+        .filter(wine => wine.type === 'Red')
+        .forEach(wine => console.log(wine));
+  });